TY - JOUR

T1 - 截面形状对早龄期钢管混凝土柱多级加载变形及承载力影响的试验研究

AU - Yu, Min

AU - Tong, Donghua

AU - Chi, Yin

AU - Ye, Jianqiao

AU - Du, Xinxi

PY - 2018/8/1

Y1 - 2018/8/1

N2 - The influence of continuous construction process on the mechanical properties of concrete-filled steel tube (CFST) is mostly considered by introducing an initial stress of steel tube, whilst the multi-level loading process as well as concrete shrinkage and creep at early age are neglected. In order to study the mechanical properties of early-age CFST under multi-level loading, axial compression deformation and ultimate bearing capacity tests of early-age square and circular CFST short columns under and after multi-level loading were performed respectively. The variations of deformation under different multi-level loading schemes as well as ultimate load bearing capacity after multi-level loading were analyzed. The results indicate that the creep deformations of both square and circular CFST under multi-level loading at early age are remarkable. The specimen deformation is significantly affected by the applied loading scheme. In addition, the deformation of circular specimen is found to be smaller than that of square specimen under the same loading condition. The impact of multi-level loading process on the bearing capacity of square and circular CFST short columns at mature stage is limited and can be neglected. The research outcome can serve as a reference for the deformation control and mechanical performance evaluation for CFST under continuous construction.

AB - The influence of continuous construction process on the mechanical properties of concrete-filled steel tube (CFST) is mostly considered by introducing an initial stress of steel tube, whilst the multi-level loading process as well as concrete shrinkage and creep at early age are neglected. In order to study the mechanical properties of early-age CFST under multi-level loading, axial compression deformation and ultimate bearing capacity tests of early-age square and circular CFST short columns under and after multi-level loading were performed respectively. The variations of deformation under different multi-level loading schemes as well as ultimate load bearing capacity after multi-level loading were analyzed. The results indicate that the creep deformations of both square and circular CFST under multi-level loading at early age are remarkable. The specimen deformation is significantly affected by the applied loading scheme. In addition, the deformation of circular specimen is found to be smaller than that of square specimen under the same loading condition. The impact of multi-level loading process on the bearing capacity of square and circular CFST short columns at mature stage is limited and can be neglected. The research outcome can serve as a reference for the deformation control and mechanical performance evaluation for CFST under continuous construction.

KW - Concrete-filled steel tube (CFST) column

KW - Creep deformation

KW - Early-age

KW - Mechanical performance

KW - Multi-level loading

KW - Static test

U2 - 10.14006/j.jzjgxb.2018.08.017

DO - 10.14006/j.jzjgxb.2018.08.017

M3 - Journal article

AN - SCOPUS:85057131833

VL - 39

SP - 148

EP - 156

JO - Jianzhu Jiegou Xuebao/Journal of Building Structures

JF - Jianzhu Jiegou Xuebao/Journal of Building Structures

SN - 1000-6869

IS - 8

ER -